Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation $(Δ_{f} H)$ of compounds is zero.

True

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False

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Solution

The correct option is B False
Enthalpy of Formation : The heat evolved or absorbed when 1 mole of a substance is formed from its constituent elements under constant pressure and temperature conditions is called enthalpy of formation.
It can be positive/negative or zero depends upon particular reaction.

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Similar questions

Q. Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation

(Δ_{f} H)

of compounds

Q. Since, the enthalpy of the elements in their standard states is taken to be zero, the heat of formation

(Δ H_{f})

of compounds:

Q. The standard enthalpies of elements in their standard(natural) states are taken as zero. On basis of this statement, we can say that the enthalpy of formation of a compound :

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
(a) is always negative
(b) is always positive
(c) may be positive or negative
(d) is never negative

Q. Assertion :Standard heat enthalpy of a compound is its heat of formation at

25^{o} C

and

1

atm. Reason: Standard heat ethalpy of pure elements have arbitrarily assumed to be zero.

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Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation (ΔfH) of compounds is zero.

Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation $(Δ_{f} H)$ of compounds is zero.